宁夏电力Issue(4)：48-53,6.DOI:10.3969/j.issn.1672-3643.2015.04.011
一起主变压器差动保护误动事故的分析
Analysis on an accident about main transformer differential protection device misaction
汪毅 1陈泓岩2
作者信息
- 1. 国网宁夏电力公司石嘴山供电公司, 宁夏 石嘴山 753000
- 2. 国网宁夏电力公司银川供电公司, 宁夏 银川 750011
- 折叠
摘要
Abstract
Aiming at an accident of outside regional fault leading to main transformer differential protection device misaction,deeply analyzes the causes of bringing differential current and the two sets of protection device action disagreement in the accident,finds out the causes of the accident and puts forward precaution misaction. The analysis result shows that the cause of the accident is that nonperiodic component of outside regional fault short-circuit current lead to low voltage side CT transient saturation of main transformer to come into being differential current, but the differential protection device based on wave form symmetrical principle cannot shutting the differential current,so caused differential protection device misaction.The precaution misaction can provide solution for avoiding such accident to happen.关键词
差动保护/CT饱和/波形对称/PR级电流互感器Key words
differential protection/CT saturation/wave form symmetry/PR level current transformer分类
信息技术与安全科学引用本文复制引用
汪毅,陈泓岩..一起主变压器差动保护误动事故的分析[J].宁夏电力,2015,(4):48-53,6.
